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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Stock-Based Compensation Plans |
Stock-Based Compensation Disclosures (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31, |
​ |  | 2024 |  | 2023 |  | 2022 |
​ | ​ | (in millions) |
Compensation cost | ​ | $ | 106.8 | ​ | $ | 97.7 | ​ | $ | 89.9 | ​
Related income tax benefit | ​ | ​ | 23.9 | ​ |  | 23.1 | ​ |  | 20.3 | ​
Capitalized as part of an asset | ​ | ​ | 1.1 | ​ |  | 1.1 | ​ |  | 1.3 | ​
Nonqualified Stock Options Status (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ |
​ | ​ | ​ | ​ | average | ​ | ​ | ​ |
​ |  | Number of options |  | exercise price |  | Intrinsic value |
​ | ​ | (in millions) | ​ | ​ | ​ | ​ | (in millions) |
Options outstanding as of January 1, 2024 |  | 2.8 | ​ | $ | 55.39 | ​ | ​ | ​ | ​
Exercised | ​ | 0.7 | ​ | ​ | 53.47 | ​ | ​ | ​ | ​
Options outstanding as of December 31, 2024 | ​ | 2.1 | ​ | $ | 56.03 | ​ | $ | 45.4 | ​
Options vested or expected to vest as of December 31, 2024 | ​ | 2.1 | ​ | $ | 56.03 | ​ | $ | 45.4 | ​
Options exercisable as of December 31, 2024 | ​ | 2.1 | ​ | $ | 56.03 | ​ | $ | 45.4 | ​
Nonqualified Stock Options Remaining Contractual Lives and Range of Exercise Prices (Table) | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- |
​ | ​ | Number of options | ​ | average remaining |
Range of exercise prices |  | outstanding |  | contractual life |
​ | ​ | (in millions) | ​ | ​ |
$37.38 - $52.41 | ​ | 0.7 | ​ | 4.6 | ​
$52.42 - $55.89 | ​ | 0.4 | ​ | 4.2 | ​
$55.90 - $60.70 | ​ | 0.5 | ​ | 6.2 | ​
$60.71 - $63.38 | ​ | 0.1 | ​ | 2.2 | ​
$63.39 - $63.98 | ​ | 0.4 | ​ | 3.2 | ​
$37.38 - $63.98 | ​ | 2.1 | ​ | ​ | ​
Nonvested Performance Share Awards Activity (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted- |
​ | ​ | performance | ​ | average grant-date |
​ |  | share awards |  | fair value |
​ | ​ | (in millions) | ​ | ​ | ​ |
Nonvested performance share awards as of January 1, 2024 |  | 0.8 | ​ | $ | 71.66 | ​
Granted | ​ | 0.3 | ​ | ​ | 82.52 | ​
Vested | ​ | 0.1 | ​ | ​ | 58.68 | ​
Canceled | ​ | 0.1 | ​ | ​ | 78.51 | ​
Nonvested performance share awards as of December 31, 2024 | ​ | 0.9 | ​ | $ | 77.38 | ​
Nonvested Restricted Stock Units Activity (Table) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted- |
​ | ​ | restricted | ​ | average grant-date |
​ |  | stock units |  | fair value |
​ | ​ | (in millions) | ​ | ​ | ​ |
Nonvested restricted stock units as of January 1, 2024 |  | 3.0 | ​ | $ | 71.83 | ​
Granted | ​ | 1.1 | ​ | ​ | 80.25 | ​
Vested | ​ | 1.0 | ​ | ​ | 59.32 | ​
Canceled | ​ | 0.1 | ​ | ​ | 78.52 | ​
Nonvested restricted stock units as of December 31, 2024 | ​ | 3.0 | ​ | $ | 78.92 | ​

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